alderfer road (t-423) bridge replacement project...total replacement of the bridge carrying alderfer...
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Transportation Solutions Building Better CommunitiesTransportation Solutions Building Better Communities
PREPARED BY MCMAHON ASSOCIATES
Alderfer Road (T-423) Bridge Replacement Project
Lower Salford TownshipMontgomery County, PA
December 2, 2020
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• Project Purpose and Need• Project Funding Sources• Overview of the Existing
Conditions• Overview of the Proposed
Improvements• Construction Staging• Traffic Control During
Construction & Detour Plan• Project Schedule including
Construction
ALDERFER ROAD (T-423) BRIDGE REPLACEMENT PROJECT
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ALDERFER ROAD (T-423) BRIDGE REPLACEMENT PROJECT
PROJECT PURPOSE & NEEDTotal Replacement of the bridge carrying Alderfer Road over the West Branch of Skippack Creek. 3 primary design objectives:
1. Replace the existing structurally deficient bridge that is in poor condition;Structurally Deficient Definition: Bridge is restricted to light vehicles, closed to traffic or requires
rehabilitation. There are elements of the bridge that need to be monitored and/or repaired and the bridge must be inspected and maintained.
2. Improve horizontal and vertical roadway geometry in the vicinity of the bridge;
3. No rise in water surface elevation during the base flood event. The project site is located in a FEMA Zone AE w/floodway.
AE: High-risk areas have at least a 1% annual chance of flooding. Area inundated by the Base Flood with Base Flood Elevations (BFE) determined. BFE: The elevation of surface water resulting from a flood that has a 1% chance of equaling or exceeding that level in any given year.
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Township Owned Structure – Township is responsible for maintenance and improvements. PennDOT completes annual inspections on behalf of the municipality for structures with a 20-foot span or greater. (Structures with a span between 8’ to 20’ are solely Twp responsibility).
Lower Salford received an award through the 2018 PA Municipal Bridge Retro-Reimbursement Program (MBRP)• Includes Federal and State funding as part of the Transportation Improvement Program
(TIP); a regionally agreed upon list of transportation projects as required by federal law;• MBRP is a reimbursement program that allows the Township to submit for reimbursement of
up to 80% of the total project cost;• The reimbursement is made at the end of the project construction;• The reimbursement can include project development, construction, and inspection
services.
ALDERFER ROAD (T-423) BRIDGE REPLACEMENT PROJECT
PROJECT FUNDING SOURCES
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Existing Structure Type• Two-span, 40’ long reinforced concrete slab
bridge; • Built in 1940; • Currently posted for 15 Tons;• Supported on a concrete pier and
concrete abutments with integral wingwalls.• Inspected annually by PennDOT.
Regular Flooding Events• May 29, 2019 Storm Event (Photos);• Existing structure cannot pass the 2-year
storm event.
ALDERFER ROAD (T-423) BRIDGE REPLACEMENT PROJECT
EXISTING CONDITIONS
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Proposed Structure Type• 51’-6” span, prestressed concrete composite adjacent box beam bridge;• Opening large enough to pass the 100-year storm event;• No change in elevation to the 100 year flood plain as result of the construction;• Bridge parapet walls and guide rail meeting current requirements;• Architectural treatment will be provided on parapet walls and safety wings;• Structural Adequacy approval is required by PennDOT, even though this is a Township structure.
• Existing Bridge
ALDERFER ROAD (T-423) BRIDGE REPLACEMENT PROJECT
PROPOSED IMPROVEMENTS
Architectural treatment example only; Henry Woods Bridge
Existing Bridge
Proposed Bridge
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Roadway Geometry• Maintain 10’ travel lanes plus adding 5’ shoulders within limits of work;• Horizontal geometric improvements to meet posted speed design criteria; superelevation for the
travel lanes; • Vertical profile adjustments to allow for large enough bridge opening; Includes raising the low
section of the roadway approximately 5 feet.
ALDERFER ROAD (T-423) BRIDGE REPLACEMENT PROJECT
PROPOSED IMPROVEMENTS
EXISTING
PROPOSED
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Environmental Studies & Permitting • Chapter 105 Joint Permit issued by DEP for the structure replacement and work area
Stream Channel Grading
Adjustments to Adjacent Properties• Access adjustments, include re-profiling to tie into the new roadway elevation;• Shared-use path replacement;• Grading modifications.
Utility Relocations • Cooperation and coordination with the Lower Salford Township Authority (LSTA), PECO Gas, PECO
Electric, North Penn Water Authority (NPWA)
ALDERFER ROAD (T-423) BRIDGE REPLACEMENT PROJECT
PROPOSED IMPROVEMENTS CONT’D
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Four Stages of Construction• Coordinated with Bridge, Roadway, and Erosion and Sedimentation Control requirements
Stage 1 – West Side of the Bridge (Sta. 7+50 to Sta. 12+10)Duration: 10 Weeks
ALDERFER ROAD (T-423) BRIDGE REPLACEMENT PROJECT
CONSTRUCTION STAGING
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Stage 2 – East Side of the Bridge (Sta. 12+10 to Sta. 13+20)Duration: 10 Weeks
ALDERFER ROAD (T-423) BRIDGE REPLACEMENT PROJECT
CONSTRUCTION STAGING
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Stage 3 – East Side of the Bridge (Sta. 12+20 to Sta. 16+50 & Wyndham Court) Duration: 10 Weeks
Stage 4 – Final Improvements (Final Paving, Markings, etc.) Duration 2 Weeks
ALDERFER ROAD (T-423) BRIDGE REPLACEMENT PROJECT
CONSTRUCTION STAGING
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ALDERFER ROAD (T-423) BRIDGE REPLACEMENT PROJECT
FINAL CONDITION
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Bridge and Roadway will be constructed under a Detour• Local access to properties and businesses along
Alderfer Road will be maintained during construction;• Detour Route will be Ruth Road, Clemens Road, Main
Street;• Advance notice variable message boards will also
be provided by the Township alerting public of upcoming detour;
• Detour approved by PennDOT.
ALDERFER ROAD (T-423) BRIDGE REPLACEMENT PROJECT
TRAFFIC CONTROL AND DETOUR PLAN
And Remember This:
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Project Development (2018-2020)• MBRP Application, preliminary engineering, environmental studies and permitting, hydraulic and hydrology
analysis, final design, structural approvals, utility coordination, property owner coordination/Right-of-Way and Temporary Construction Easement acquisition.
Project Advertisement/Letting (January 2021 – March 2021)• Publicly advertised using PennBID which simplifies the municipal letting process;• Bid package available to large amount of qualified contractors• Anticipated Award March 3, 2021 BOS Meeting
Project Construction (April 2021 – November 2021)• Anticipated Pre-Construction Meeting Mid-Late March 2021• Notice-to-Proceed April 2021 • Construction Duration Approximately 8 Months, Utility Coordination Schedule is Critical
ALDERFER ROAD (T-423) BRIDGE REPLACEMENT PROJECT
PROJECT SCHEDULE
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QUESTIONS?CONTACT INFORMATION:
Stephanie L. Butler, P.E., Senior Project ManagerMcMahon Associates, Inc. sbutler@mcmahonassociates.com215-283-9444, Ext. 1256
Christopher Seaman, P.E., CBI, Senior Project Manager (Structures)McMahon Associates, Inc. cseaman@mcmahonassociates.com
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